PUA: Possibly Unwanted Application, these software usually have not very good reputation, bundled in some silent installers.

Macro: Macro viruses are a type of malware stored in Microsoft Office file/template macros. Once this file is opened, the macro will be run, activating the macro virus so it will reside in the Normal template. Afterwards, all auto-saved files will be infected with this macro virus.

Recently, ransomware become one of the most popular threats all over the world, it will encrypt your personal data and ask for some money(usually use Bitcoin). Although the master key of TeslaCrypt has become public and many antivirus vendors have created related decryptor, there are still lots of ransomwares which can not be decrypted.